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Articles 271 - 300 of 917
Full-Text Articles in Earth Sciences
Late Campanian Larger Benthic Foraminifera From The Zekeriyaköy Formation (İstanbul,Nw Turkey): Taxonomy, Stratigraphy, And Paleogeography, Mert Eren Erdem, Ercan Özcan, Ali̇ Osman Yücel, Aral I. Okay, Sadikcan Erbay, Si̇bel Kayğili, İsak Yilmaz
Late Campanian Larger Benthic Foraminifera From The Zekeriyaköy Formation (İstanbul,Nw Turkey): Taxonomy, Stratigraphy, And Paleogeography, Mert Eren Erdem, Ercan Özcan, Ali̇ Osman Yücel, Aral I. Okay, Sadikcan Erbay, Si̇bel Kayğili, İsak Yilmaz
Turkish Journal of Earth Sciences
North of İstanbul, the thick Upper Cretaceous volcanic and volcanoclastic sequence of the Yemişliçay Group is nonconformably overlain by the neritic clastic and carbonate sequence of the Zekeriyaköy Formation. This unit, either placed within the volcanic sequence or interpreted to overlie it, was studied near Zekeriyaköy for its larger foraminifera, previously recurrently referred to as the Maastrichtian. The basal epiclastic sandstone beds of the Zekeriyaköy Formation immediately above the volcanic sequence contain Praesiderolites dordoniensis and rare rudist shells. The higher sandstone and limestone beds comprise assemblages of Lepidorbitoides campaniensis, Orbitoides megaloformis, Vanderbeekia catalana, Siderolites gr. calcitrapoides, Sirtina orbitoidiformis, Praestorrsella roestae, …
Late Pleistocene-Holocene Characteristics Of The North Anatolian Fault At Adapazarı Basin: Evidence From The Age And Geometry Of The Fluvial Terrace Staircases, Mehmet Korhan Erturaç
Late Pleistocene-Holocene Characteristics Of The North Anatolian Fault At Adapazarı Basin: Evidence From The Age And Geometry Of The Fluvial Terrace Staircases, Mehmet Korhan Erturaç
Turkish Journal of Earth Sciences
The Late Pleistocene-Holocene evolution of the Adapazarı Basin was investigated using the stratigraphy, geometry, and absoluteluminescence dating of the 4-step fluvial terrace staircases of the Sakarya River. The results revealed that the fluvial cycle was primarily related to relative sea level changes of the Black Sea. The initiation of deposition and the abandonment ages of the terraces indicated relative high stands during marine isotope stage (MIS) 5a (~84-72 ka), 3 (40-30 ka), and 1 (9 ka-recent). The erosional periods in between the terrace steps reflected the response of the Sakarya River to the significantly low stands of the sea. The …
Investigation Of Defective Trees Using Electric Resistivity Method, Turgay İşseven, Yi̇ği̇t Yilmaz, Nedi̇m Gökhan Aydin
Investigation Of Defective Trees Using Electric Resistivity Method, Turgay İşseven, Yi̇ği̇t Yilmaz, Nedi̇m Gökhan Aydin
Turkish Journal of Earth Sciences
The resistivity method in geophysics is used to solve various geological and engineering problems. Recently, this nondestructive method has been used on trees to investigate possible infections within the trunks by scanning resistivity variations. In this study, the electrical resistivity method has been aimed to be applied on various trees in Istanbul, Turkey to test whether the method applies to trees via regular resistivity measurement devices used in geophysics. Firstly, a multi-channel resistivity device, that is designed to automatically take measurements on the ground, is modified to carry out the measurements on trees. The measured data are processed using two …
Formation Age, Geochemical Characteristics And Petrogenesis Of Syenogranite In Chaihe Area, Central Daxingan Mountains: Constraints On Late Carboniferous Evolution Of The Xing'an And Songnen Blocks, Dongxue Li, Changqing Zheng, Chenyue Liang, Xiao Zhou
Formation Age, Geochemical Characteristics And Petrogenesis Of Syenogranite In Chaihe Area, Central Daxingan Mountains: Constraints On Late Carboniferous Evolution Of The Xing'an And Songnen Blocks, Dongxue Li, Changqing Zheng, Chenyue Liang, Xiao Zhou
Turkish Journal of Earth Sciences
The tectonic evolutionary history between the Xing'an Block (XB) and Songnen Block (SB) in the eastern Central Asia Orogenic Belt (CAOB) has been hotly debated. In this study, we present a series of new data to provide a better constraint on the magmatic process during plate subduction and its implications for the regional tectonic evolution of XB and SB, even the CAOB. The whole-rock geochemistry and zircon U-Pb chronology of syenogranite in the Chaihe area of the Great Xing'an Range have been carried out. The dating results show that the syenogranite was formed in the Late Carboniferous during the 303.1-316.1 …
A Holocene Paleomagnetic Record From Küçükçekmece Lagoon, Nw Turkey, Özlem Makaroğlu
A Holocene Paleomagnetic Record From Küçükçekmece Lagoon, Nw Turkey, Özlem Makaroğlu
Turkish Journal of Earth Sciences
Lake sediments are very useful for providing high-resolution records of geomagnetic field variations, especially for the Holocene period. We present high-resolution paleomagnetic records from three cores (KCL12P1, P2, and P3) recovered from Küçükçekmece Lagoon, located at the northern shoreline of the Sea of Marmara, Turkey. The cores were subjected to a comprehensive paleomagnetic and rock magnetic investigation using oriented samples. According to the age-depth model, based on radiocarbon dating and X-ray fluorescence-derived Ca/Ti element ratios, tuned to available oxygen isotope records based on an absolute calendar-year time-scale, we obtained a new paleomagnetic record for the last 3800 years. Low paleointensities …
Source Modelling And Stress Transfer Scenarios Of The October 30, 2020 Samos Earthquake: Seismotectonic Implications, Sotiris Sboras, Ilias Lazos, Stylianos Bitharis, Christos Pikridas, Dimitrios Galanakis, Aristeidis Fotiou, Alexandros Chatzipetros, Spyros Pavlides
Source Modelling And Stress Transfer Scenarios Of The October 30, 2020 Samos Earthquake: Seismotectonic Implications, Sotiris Sboras, Ilias Lazos, Stylianos Bitharis, Christos Pikridas, Dimitrios Galanakis, Aristeidis Fotiou, Alexandros Chatzipetros, Spyros Pavlides
Turkish Journal of Earth Sciences
On October 30, 2020, a strong earthquake (Mw6.6-7.0) occurred offshore, just north of Samos Island, causing life losses, injuries and damages, especially on the Turkish side. The broader area is characterized by a complex geodynamic setting with both rich seismic history and numerous active faults of different direction and kinematics. The first aim of this study is to define the seismic source of the mainshock, based on seismological and geodetic data (GPS measurements and originally processed GNSS records), as well as our field observations on Samos Island few days after the mainshock. The integration of this information leads to a …
Geochemistry And Mineralogy Of The Shallow Subsurface Red Sea Coastal Sediments, Rabigh, Saudi Arabia: Provenance And Paleoenvironmental Implications, Rabea Haredy, Ibrahim Mohamed Ghandour
Geochemistry And Mineralogy Of The Shallow Subsurface Red Sea Coastal Sediments, Rabigh, Saudi Arabia: Provenance And Paleoenvironmental Implications, Rabea Haredy, Ibrahim Mohamed Ghandour
Turkish Journal of Earth Sciences
Mineralogical and geochemical characteristics of the shallow subsurface sediments retrieved from a short sediment core (2.05 m long) collected from the tidal flat south of Al-Kharrar Lagoon, Rabigh area, Saudi Arabia, are presented to determine the impact of temporal change of depositional environment and distinguish the principal control(s) on their chemical composition. The sediments are dominantly siliciclastic, consisting of two vertically stacked sedimentary facies: lagoonal (LG) gray silt-rich mud to argillaceous very fine sand at the base and intertidal flat (TF) brown mud and argillaceous very fine-grained sands at the top. The sediments of the two facies are similar in …
Epidote - Lawsonite Coexistence In Blueschist-Facies Blockfrom The Tavşanlı Zone - Turkey: Petrological Implications, Mete Çeti̇nkaplan
Epidote - Lawsonite Coexistence In Blueschist-Facies Blockfrom The Tavşanlı Zone - Turkey: Petrological Implications, Mete Çeti̇nkaplan
Turkish Journal of Earth Sciences
Metamorphic evolution of an epidote-lawsonite blueschist sample characterized by the coexistence of lawsonite and epidote from Sivrihisar area (Tavşanlı Zone) was studied herein in terms of petrology and mineral equilibria. Based on the textural evidence and phase composition, 2 prograde stages, defined by assemblage-I and -II, and 1 retrograde stage were recognized. Assemblage-I indicates epidote-blueschist facies conditions (12 ± 1 kbar / 485 ± 10 °C). Assemblage-II is characterized by the coexistence of epidote and lawsonite (17 ± 1 kbar / 515 ± 10 °C) corresponding to the interface of lawsonite blueschist and epidote blueschist facies. Phase diagram calculations and …
Geochemistry, Risk Assessment, And Pb Isotopic Evidence For Sources Of Heavy Metals Instream Sediments Around The Ulukışla Basin, Niğde, Southern Turkey, Abdurrahman Lermi̇, Emmanuel Daanoba Sunkari
Geochemistry, Risk Assessment, And Pb Isotopic Evidence For Sources Of Heavy Metals Instream Sediments Around The Ulukışla Basin, Niğde, Southern Turkey, Abdurrahman Lermi̇, Emmanuel Daanoba Sunkari
Turkish Journal of Earth Sciences
Concentrations of selected elements (Al, Fe, Mn, Mo, As, Cd, Cu, Cr, Ni, Co, Pb, Sb, and Zn) and Pb isotope ratios were determined in 53 sediments from Alihoca, Gümüş, Horoz, and Çakıt streams around the south-central Taurides (Ulukışla Basin), Niğde, which is a known mining province in Turkey. Several pollution and risk assessment indices were used to assess possible heavy metal pollution in the stream sediments and the associated potential ecological risks. Concentrations of As, Cd, Cu, Cr, Ni, Co, Pb, Sb, and Zn were elevated in the streams located near ancient mines, active mines, and slag piles in …
Assessment Of Acid Mine Drainage Formation Using Geochemical And Static Tests In Mutki(Bitlis, Se Turkey) Mineralization Area, Mehmet Ali̇ Gücer, Selçuk Alemdağ, Enver Akaryali
Assessment Of Acid Mine Drainage Formation Using Geochemical And Static Tests In Mutki(Bitlis, Se Turkey) Mineralization Area, Mehmet Ali̇ Gücer, Selçuk Alemdağ, Enver Akaryali
Turkish Journal of Earth Sciences
In this study, geochemical analyses, as well as short-term contact leaching and acid-base accounting tests, were carried out to determine the occurrence of acid mine drainage (AMD) by static tests in the ore stockpile areas at the Mutki Cu-Fe-Cr deposit (Bitlis, SE Turkey). According to the short-term contact leaching tests, the high enrichment in trace element concentrations in ore-bearing samples, especially in potentially toxic metals such as Cr, Cu, Mn, and Zn, were directly related to sulphide and oxide mineralizations. The pH (3.27-4.05) values of water samples, together with the classification of the intracontinental water resources, indicated that the water …
Last Glacial Climate Oscillations And Sudden Environmental Changes Investigated In Stalagmites From Southwest Sulawesi, Western Pacific, Ezgi̇ Ünal İmer, İbrahi̇m Tonguç Uysal, Emma St Pierre, Jian Xin Zhao, James Shulmeister
Last Glacial Climate Oscillations And Sudden Environmental Changes Investigated In Stalagmites From Southwest Sulawesi, Western Pacific, Ezgi̇ Ünal İmer, İbrahi̇m Tonguç Uysal, Emma St Pierre, Jian Xin Zhao, James Shulmeister
Turkish Journal of Earth Sciences
We investigated two stalagmites from the Saripa Cave and Bumi Cave in southern Sulawesi, Indonesia, using high-precision U-series dating and high-resolution trace element and C-O-Sr isotope analysis. The growth record (from 10.4 ± 0.1 ka to 77.4 ± 0.9 ka) of the Saripa Cave stalagmite (SR04-ST3) is fragmented with two major (at the top: 10.4-11.6 ka and middle: 43.8-44.7 ka sections of the stalagmite) and some short (middle and bottom sections) growth phases, interrupted by long-lasting growth hiatuses. Both the timing of the growth phases and the δ18O values for different growth phases are correlated with those of cold/dry (~22 …
Upper Paleocene-Lower Eocene Calcareous Nannofossil Stratigraphy At The Misheiti Section, Central Sinai, Egypt, Atef M. Kasem, Sherwood Wise, Mahmoud Faris, Sherif Farouk, Esam Zahran
Upper Paleocene-Lower Eocene Calcareous Nannofossil Stratigraphy At The Misheiti Section, Central Sinai, Egypt, Atef M. Kasem, Sherwood Wise, Mahmoud Faris, Sherif Farouk, Esam Zahran
Turkish Journal of Earth Sciences
Calcareous nannofossil, δ13C, δ18O, and carbonate content data were used to define and reveal the variations across the latest Paleocene-earliest Eocene interval at the Misheiti Section, Central Sinai, Egypt. The upper part of Tarawan Formation, the Esna Formation, and the lowermost Thebes Formation were included in this study. In this study, the Esna Formation is informally divided into Hanadi/Mahmiya and Abu Had members. Four calcareous nannofossil zones (NP9, NP10, NP11, and NP12) and four subzones (NP9a, NP9b, NP10a, and NP10b) were recognized. The biostratigraphic importance of significant calcareous nannofossil bioevents associated with the P/E boundary was discussed. The LOs of …
Traces Of Mediterranean Origin Holocene Transgression In The Drainage Basin Of Riva-Çayağzı Creek Of The Black Sea (Northeastern İstanbul-Turkey), Bülent Doğan, Ahmet Karakaş, Ati̇ke Nazi̇k, İbrahi̇m Engi̇n Meri̇ç
Traces Of Mediterranean Origin Holocene Transgression In The Drainage Basin Of Riva-Çayağzı Creek Of The Black Sea (Northeastern İstanbul-Turkey), Bülent Doğan, Ahmet Karakaş, Ati̇ke Nazi̇k, İbrahi̇m Engi̇n Meri̇ç
Turkish Journal of Earth Sciences
The Riva-Çayağzı Creek (İstanbul, Black Sea) pours into the Black Sea from the coasts of Turkey. In the drainage basin of this creek, both deep and shallow drillings were undertaken, and the minimum thickness of Holocene stratigraphy was determined as 30 m. The Holocene young deposits are mainly composed of fine-grained sediments and clay, which has the most prominent thickness. The energy of water during the sedimentation process was low and stagnant in the Riva-Çayağzı Creek basin. When the marine mollusc fossils obtained from the shallow boring cores are evaluated, it can be deduced that the sea level in the …
Geochemical And Industrial Properties Of The Kejal Kaolin Deposit, Nw Iran, Tohid Nouri, Rahim Masoumi
Geochemical And Industrial Properties Of The Kejal Kaolin Deposit, Nw Iran, Tohid Nouri, Rahim Masoumi
Turkish Journal of Earth Sciences
The Kejal kaolin deposit, situated in the northwest of Iran, is considered a small part of the Hashtjin hydrothermal zone. The kaolinization process in this deposit has occurred in ignimbritic and volcanic tuff parent rocks in different grades such that severely kaolinized samples can be found in the middle section of the kaolinization profile. Kaolinite is the most abundant clay mineral in the studied samples. Quartz and cristobalite are the main minerals while anatase is the minor mineral of the kaolin samples. Among the major oxides, SiO2, Al2O3, and TiO2 show the highest concentrations in kaolin samples. The mass change …
Geochemistry And Petrography Of Beach Sands Along The Western Coast Of Ghana:Implications For Provenance And Tectonic Settings, Mahamuda Abu, Emmanuel Daanoba Sunkari
Geochemistry And Petrography Of Beach Sands Along The Western Coast Of Ghana:Implications For Provenance And Tectonic Settings, Mahamuda Abu, Emmanuel Daanoba Sunkari
Turkish Journal of Earth Sciences
The paleoweathering, provenance, and tectonic setting of sediments of the western coast of Ghana were unraveled using the geochemistry of 29 beach sands, which are characterized by coarse-, medium-, and fine-grained sizes. The coarse-grained beach sands contain higher SiO2 content (2.9-96 wt.%) than the medium-grained (4.9-94 wt.%) and fine-grained (16.1-90.7 wt.%) sands, implying that the increase in grain size is related to the increase in SiO2 content. Al2O3 and CaO concentrations are higher in the fine- and medium-grained sands than the coarse-grained sands. The beach sands are compositionally immature based on the index of compositional variable values (1.17-141) and Th/Sc …
Excess Lifetime Cancer Risk Due To Natural Radioactivity In Gümüşhane Province, Ne Turkey, Nafiz Maden, Enver Akaryali, Mehmet Ali̇ Gücer
Excess Lifetime Cancer Risk Due To Natural Radioactivity In Gümüşhane Province, Ne Turkey, Nafiz Maden, Enver Akaryali, Mehmet Ali̇ Gücer
Turkish Journal of Earth Sciences
In this study, 162 in situ measurements of 238U, 232Th, and 40K radionuclide concentrations dataset taken by the gamma-ray spectrometer in Gümüşhane, Turkey are presented. The gamma ray measurements were performed by a 512-channel, three-window gamma-ray spectrometry equipment made by GF Instruments. We first observed the radionuclides of the 238U, 232Th, and 40K values in Gümüşhane. We then calculated the hazard indices of gamma radiation such as annual effective dose equivalent (AEDE), internal and external hazard index (Hin, Hex), and excess lifetime cancer risk (ELCR) based on the radionuclide abundances of 238U, 232Th, and 40K for the first time. In …
Microfossil Assemblages (Diatoms, Calcareous Nannofossils, And Silicoflagellates),Paleoenvironment, And Hydrocarbon Source Rock Potential Of The Oligocene Ruslarformation At Karadere, Bulgaria, Emilia Tulan, Reinhard F. Sachsenhofer, Jakub Witkovski, Gabor Tari, Stjepan Coric, Achim Bechtel
Microfossil Assemblages (Diatoms, Calcareous Nannofossils, And Silicoflagellates),Paleoenvironment, And Hydrocarbon Source Rock Potential Of The Oligocene Ruslarformation At Karadere, Bulgaria, Emilia Tulan, Reinhard F. Sachsenhofer, Jakub Witkovski, Gabor Tari, Stjepan Coric, Achim Bechtel
Turkish Journal of Earth Sciences
The Oligocene Ruslar Formation, an equivalent of the Maykop Suite, is a potential hydrocarbon source rock in the western Black Sea Basin. In contrast to the offshore areas, the depositional environment and hydrocarbon source rock potential of onshore Bulgaria sediments are largely unknown. Hence, a 14-m-thick section of the Ruslar Formation, exposed near Karadere (Black Cape) along the Black Sea coast, provides an excellent opportunity to study the upper part of the Ruslar Formation. Here, laminated diatomrich mudstones with frequent thin sandstone beds and a prominent concretion horizon are exposed. Furthermore, the fossil diatom assemblages provide a key component to …
The Ypresian To Lutetian Marine Record In Nw Turkey: A Revised Biostratigraphy Andchronostratigraphy And Implications For Eocene Paleogeography, Ercan Özcan, Zahi̇de Özcan, Aral I. Okay, Kenan Akbayram, Aynur Hakyemez
The Ypresian To Lutetian Marine Record In Nw Turkey: A Revised Biostratigraphy Andchronostratigraphy And Implications For Eocene Paleogeography, Ercan Özcan, Zahi̇de Özcan, Aral I. Okay, Kenan Akbayram, Aynur Hakyemez
Turkish Journal of Earth Sciences
The Eocene sedimentary units in the Kocaeli and Armutlu peninsulas and İznik-Geyve region (northwest Turkey) consist of marine siliciclastic and carbonate deposits, locally intercalated with volcaniclastic rocks and tuffs (Middle Eocene Magmatic Rocks-MEMR). The record of larger benthic fauna (LBF) and pelagic microfossils, such as planktonic foraminifera and calcareous nannoplankton, combined with lithological description, indicate a wide spectrum of depositional environments ranging from shallowto deep-marine. These deposits contain in situ and/or allochthonous assemblages of orthophragminids, nummulitids, subordinate rotaliids, and sparse alveolinids. The in situ assemblages (mainly orthophragminids) point to several episodes of shallow marine depositional conditions during a) early Ypresian …
Alluvial-Lacustrine Sedimentation And Volcaniclastic Deposition In An Intracontinental Tectonic Graben: Paleoenvironmental Evolution Of The Neogene Sinanpaşa Basin, West-Central Turkey, Eli̇f Akiska, Baki̇ Erdoğan Varol
Alluvial-Lacustrine Sedimentation And Volcaniclastic Deposition In An Intracontinental Tectonic Graben: Paleoenvironmental Evolution Of The Neogene Sinanpaşa Basin, West-Central Turkey, Eli̇f Akiska, Baki̇ Erdoğan Varol
Turkish Journal of Earth Sciences
This study reports on the Sinanpaşa Basin, a typical example of the Miocene tectonic intracontinental grabens formed in West Anatolia, Turkey. The study reconstructs the paleoenvironmental and paleogeographic history of the graben based on a detailed sedimentological analysis of basin-fill deposits exposed mainly near the graben's northern and southern margins. The sedimentary paleoenvironments in the graben range from basin-margin alluvial fan systems and basin-axis fluvial distributary system to an intrabasinal shallow lake environment surrounded by peat-forming mires, changing from carbonate to more clayey, episodically evaporitic, and shifting its shorelines considerably. The spatial distribution and stratigraphic stacking of these paleoenvironments indicate …
Petrology Of The Late Triassic Mafic Volcanic Rocks From The Antalya Complex, Southernturkey: Evidence For Mantle Source Characteristics During The Neotethyan Rifting, Utku Bağci, Tamer Rizaoğlu, Güzi̇de Önal, Osman Parlak
Petrology Of The Late Triassic Mafic Volcanic Rocks From The Antalya Complex, Southernturkey: Evidence For Mantle Source Characteristics During The Neotethyan Rifting, Utku Bağci, Tamer Rizaoğlu, Güzi̇de Önal, Osman Parlak
Turkish Journal of Earth Sciences
The Antalya Complex in southern Turkey comprises a number of autochthonous and allochthonous units that originated from the Southern Neotethys. Late Triassic volcanic rocks are widespread in the Antalya Complex and are important for the onset of the rifting stage of the southern Neotethys. The studied Late Triassic volcanic rocks within the Antalya Complex are exposed in the southern part of Saklıkent (Antalya) region. They are represented by pillow, massive, and columnar-jointed lava flows with volcaniclastic breccias and pelagic limestone intercalations. Spilitic basalts exhibit intersertal, microlithic porphyritic, and ophitic textures and are represented by plagioclase, pyroxene, and olivine. Secondary phases …
Hyracoidea From The Middle Miocene Hominoid Locality Of Paşalar (Nw Turkey), Martin Pickford, Serdar Mayda, Berna Alpagut, Fatma Arzu Demi̇rel, Ayşegül Şarbak, Tümel Tanju Kaya
Hyracoidea From The Middle Miocene Hominoid Locality Of Paşalar (Nw Turkey), Martin Pickford, Serdar Mayda, Berna Alpagut, Fatma Arzu Demi̇rel, Ayşegül Şarbak, Tümel Tanju Kaya
Turkish Journal of Earth Sciences
Previously available samples of Hyracoidea from Paşalar (MN 6, Middle Miocene), Turkey, have indicated the presence of Pliohyracidae at the site, but the material was too scanty for confident identification. The single upper molar, an upper molar ectoloph fragment and an ascending ramal fragment were too uninformative for determining the taxonomic identity of the fossils, although several names have been proposed in the literature. Additional fossils collected from Paşalar include upper and lower premolars, which help to tie down the affinities of this hyracoid. They are attributed to the genus Prohyrax, but were not named specifically, even though they are …
When Did The Drainage System Of The Kızılırmak River Form In Cappadocia (Anatolia,Turkey)? A Revised Geological And Geomorphological Stratigraphy, Uğur Doğan, Çeti̇n Şenkul
When Did The Drainage System Of The Kızılırmak River Form In Cappadocia (Anatolia,Turkey)? A Revised Geological And Geomorphological Stratigraphy, Uğur Doğan, Çeti̇n Şenkul
Turkish Journal of Earth Sciences
The Kızılırmak is the longest river in Turkey, extending from the western part of eastern Anatolia to the Black Sea, and crossing the orogenic Central Anatolian Plateau (CAP) and Black Sea Mountains. This study focuses on the formation period of the drainage system of the Kızılırmak River in the Cappadocia region, which is situated in the middle of the CAP. The Upper Pliocene-Quaternary geological and geomorphological stratigraphy of the Cappadocia region was revised with new findings and those of previous studies. In this study, the oldest terrace (Sünnetli Tepe Terrace, T0) of the Kızılırmak River was identified 214 m above …
Assessment Of Element Concentrations In Surface Sediment Samples Fromsığacık Bay (Eastern Aegean), Özde Bakak, Fi̇li̇z Küçüksezgi̇n, Fai̇k Erdeni̇z Özel
Assessment Of Element Concentrations In Surface Sediment Samples Fromsığacık Bay (Eastern Aegean), Özde Bakak, Fi̇li̇z Küçüksezgi̇n, Fai̇k Erdeni̇z Özel
Turkish Journal of Earth Sciences
Concentrations of Al, Fe, As, Co, Cr, Cu, Mn, Ni, Pb, Zn, Hg, and organic carbon, and grain size distribution were investigated in the surface sediments of 7 sampling stations in the Sığacık Bay (western Anatolia) in December 2016. At all of the sampling stations, the concentrations of Pb, Ni, Cr, and As were higher than the average shale values. The highest concentrations of Pb, Cu, Zn, As, and Hg were found at stations near Doğanbey Cape. The possible sources of pollution were evaluated using several parameters: the enrichment factor (Ef), contamination factor (Cf), and contamination degree (Cd). The Ef …
Review Of Late Cretaceous Volcanogenic Massive Sulfide Mineralization In The Easternpontides, Ne Turkey, Mustafa Kemal Revan
Review Of Late Cretaceous Volcanogenic Massive Sulfide Mineralization In The Easternpontides, Ne Turkey, Mustafa Kemal Revan
Turkish Journal of Earth Sciences
The production of Cu-Zn from volcanogenic massive sulfide (VMS) deposits in the eastern Pontides began in the early 1900s, with the exploitation of high-grade ores scattered across the district. The district still possesses economically important blind VMS and associated sulfide deposits. Careful descriptive documentation of the typical features of these VMS ores illustrated the geological characteristics that are important in identifying ore localities and can be used to define exploration targets. The eastern Pontide VMS deposits are examples of volcanic-hosted massive sulfide deposits that exhibit many of the characteristics typical of bimodal-felsic-type VMS mineralization. Nearly all known VMS deposits in …
Latest Priabonian Larger Benthic Foraminiferal Assemblages At The Demise Of Thesoğucak Carbonate Platform (Thrace Basin And Black Sea Shelf, Nw Turkey):Implications For The Shallow Marine Biostratigraphy, Ali̇ Osman Yücel, Ercan Özcan, Ümi̇tcan Erbi̇l
Latest Priabonian Larger Benthic Foraminiferal Assemblages At The Demise Of Thesoğucak Carbonate Platform (Thrace Basin And Black Sea Shelf, Nw Turkey):Implications For The Shallow Marine Biostratigraphy, Ali̇ Osman Yücel, Ercan Özcan, Ümi̇tcan Erbi̇l
Turkish Journal of Earth Sciences
The Eocene-Oligocene transition corresponds to a significant biotic turnover globally. In shallow marine realms, the larger benthic foraminifera (LBF) belonging to most nummulitids and all orthophragminids became extinct at or near the Eocene/Oligocene boundary, reflecting the environmental deterioration. We here record the advanced developmental stages of midlatitude LBF from the Soğucak Carbonate Platform in NW Turkey on the brink of their extinction in the Tethys. The LBF assemblages in the uppermost part of the platform, exposed in Gökçetepe and Karaburun in the Thrace Basin and Black Sea shelf, are represented by the dominant occurrence of Heterostegina d'Orbigny, 1826, Spiroclypeus Douville, …
Stratigraphy Of The Mio-Pleistocene Sequence In The Göktepe Region Based On The Fossilrecord (Muğla, Sw Turkey), Özlem Yilmaz, Tali̇p Güngör, Mi̇ne Sezgül Kayseri̇ Özer, Funda Akgün, Serdar Mayda, Tümel Tanju Kaya, Ati̇ke Nazi̇k, Yeşi̇m Büyükmeri̇ç
Stratigraphy Of The Mio-Pleistocene Sequence In The Göktepe Region Based On The Fossilrecord (Muğla, Sw Turkey), Özlem Yilmaz, Tali̇p Güngör, Mi̇ne Sezgül Kayseri̇ Özer, Funda Akgün, Serdar Mayda, Tümel Tanju Kaya, Ati̇ke Nazi̇k, Yeşi̇m Büyükmeri̇ç
Turkish Journal of Earth Sciences
The sedimentary basins in SW Turkey (e.g., Kale-Tavas, Yatağan, and Ören basins) that developed after the closure of the Neotethys Ocean allow the reconstruction of the tectonic and paleogeographic history of the region. Due to the rich coal reserves, the Yatağan Basin provides a substantial amount of data to infer the paleoenvironment and paleoclimate during the middle Miocene to Pleistocene. Our work provides new paleontological and radiometric data to constrain the age, paleoclimate, and depositional environment of terrestrial deposits of this basin. We present fossil findings such as mammal bones, gastropods, and palynomorph assemblages from the base of the Turgut …
Sedimentology And Hydrocarbon Potential Of The Late Ordovician Glacial Deposits On Thearabian Platform And Southeastern Turkey, Muhi̇tti̇n Şenalp, Sema Teti̇ker
Sedimentology And Hydrocarbon Potential Of The Late Ordovician Glacial Deposits On Thearabian Platform And Southeastern Turkey, Muhi̇tti̇n Şenalp, Sema Teti̇ker
Turkish Journal of Earth Sciences
The Late Ordovician glacial deposits are widespread and constitute a significant portion of the Early Paleozoic stratigraphic sequence of the cover rocks of the Arabian and African platforms. The glaciation lasted less than one million years between the Late Ashgillian (445 Ma) and Early Silurian (444 Ma) but it had a strong impact on the whole area. It has been proven that the glaciofluvial sandstones form important oil and gas reservoirs in Saudi Arabia and in North African and other Middle Eastern countries, including SE Turkey, but their heterogeneity and internal lithofacies characteristics have not been fully understood yet. In …
Apmdisc: An Online Computer Program For The Geochemical Discrimination Ofsiliciclastic Sediments From Active And Passive Margins, María Abdelaly Rivera-Gómez, John Selvamony Armstrong-Altrin, Surendra P. Verma, Lorena Díaz-González
Apmdisc: An Online Computer Program For The Geochemical Discrimination Ofsiliciclastic Sediments From Active And Passive Margins, María Abdelaly Rivera-Gómez, John Selvamony Armstrong-Altrin, Surendra P. Verma, Lorena Díaz-González
Turkish Journal of Earth Sciences
An online computer program called APMdisc (Active and Passive Margin discrimination) for the discrimination of siliciclastic sediments from active and passive margin settings was written in Java along with the ZK framework. APMdisc calculates four complex discriminant functions (DFilr(A-P)M and DFmlr(A-P)M; DFilr(A-P)MT and DFmlr(A-P)MT), which represent linear combinations of log-ratios of all ten major elements (M) and ten major and six trace elements (MT), respectively. In these equations, ilr and mlr stand for isometric log-ratio and modified log-ratio transformations of the chemical composition of active and passive margin sediments, respectively. The ilr transformation provided the same results as the mlr …
In Situ Magnetic Susceptibility And Gamma Radiation Data In The Candela-Monclovaintrusive Belt, Northeast Mexico: Case Studies Of The Cerro Colorado And Cerromarcelinos Plutons, Jose Alberto Batista Rodriguez, Edgar Rodriguez, Pedro Rodriguez Riojas, Roberto Diaz Martinez, Antonio Rodriguez Vega, Felipe De Jesus Lopez Saucedo
In Situ Magnetic Susceptibility And Gamma Radiation Data In The Candela-Monclovaintrusive Belt, Northeast Mexico: Case Studies Of The Cerro Colorado And Cerromarcelinos Plutons, Jose Alberto Batista Rodriguez, Edgar Rodriguez, Pedro Rodriguez Riojas, Roberto Diaz Martinez, Antonio Rodriguez Vega, Felipe De Jesus Lopez Saucedo
Turkish Journal of Earth Sciences
The Cerro Marcelinos (CM) and Cerro Colorado (CC) plutons are part of the Candela-Monclova intrusive belt (NE Mexico), which is mid-Eocene in age (43-35 Ma). It intrudes into the Sabinas Basin, primarily made up of limestones, of Lower and Upper Cretaceous age. Around several intrusions, including the CM and CC plutons, mineralizations are known. However, how much hidden mineralizations would occur is not known. Trends within the plutons and in contact aureoles are also poorly described at present. Therefore, we provide here in situ magnetic susceptibility (MS) and gamma ray spectrometry (GS) data along two composite transects, one in each …
Paleobathymetric Evolution Of The Miocene Deposits Of The Gömbe Sector Of The Lycianforeland And Aksu Basins In Antalya, Turkey, Fati̇h Seçki̇n Şi̇ş, Tanja J. Kouwenhoven, Ayten Koç, Nuretdi̇n Kaymakci
Paleobathymetric Evolution Of The Miocene Deposits Of The Gömbe Sector Of The Lycianforeland And Aksu Basins In Antalya, Turkey, Fati̇h Seçki̇n Şi̇ş, Tanja J. Kouwenhoven, Ayten Koç, Nuretdi̇n Kaymakci
Turkish Journal of Earth Sciences
The evolution of the Lycian Foreland and Aksu basins are associated with the Africa-Eurasia convergence and collision of intervening continental blocks. Both basins developed around the Beydağları, a Mesozoic carbonate platform, which constitutes the main component and western limb of the Isparta Angle. The Gömbe Basin is an integral part of the Lycian Foreland Basin that comprises mainly Eocene to Late Miocene turbidites, onto which the allochthonous Lycian and Antalya nappes thrust over. The Aksu Basin, however, developed in the inner part of the Isparta Angle and is bounded by the Aksu Thrust in the east. During their evolution, these …